Question

It was Paheli’s birthday, her brother Simba was helping her to decorate the house for the birthday party and their parents were also busy making other arrangements. Following were the activities going on at Paheli’s home:
(i) Simba blew balloons and put them on the wall.
(ii) Some of the balloons burst.
(iii) Paheli cut colour full strips of paper and put them on the wall with the help of tape.
(iv) She also made some flowers by origami (paper folding) to decorate the house.
(v) Her father made dough balls.
(vi) Mother rolled the dough balls to make puris.
(vii) Mother heated oil in a pan.
(viii) Father fried the puries in hot oil.
Identify the activities at Paheli’s home as those that can be reversed and those which cannot be reversed.

Answer 1

Hint:Chemical reactions are those reactions in which reactants under some conditions like by changing the pressure, temperature or by introducing the catalyst reactant gets converted into products. There are many types of chemical reactions like reversible, irreversible, exothermic, endothermic etc.

Complete step-by-step answer:To know which reaction is reversible or which is irreversible in nature we must know about both of them. Reversible reactions are those in which a substance is of reversible nature i.e. can be returned to its original state whereas irreversible which are not reversible in nature i.e. a substance which can-not return to its original state once the reaction is completed.
Most of the physical changes are reversible in nature and all chemical changes are irreversible in nature. In case of reversible changes chemical properties of the system remain the same while in irreversible changes chemical properties of the system changes.
Hence the reversible changes out of these activities are:
(i) Simba blew balloons and put them on the wall.
(iv) She also made some flowers by origami (paper folding) to decorate the house.
(v) Her father made dough balls.
(vi) Mother rolled the dough balls to make puris.
(vii) Mother heated oil in a pan.
These are the changes in which physical properties occur and also these are physical activities.

Irreversible changes out of these activities are:
(ii) Some of the balloons burst.
(iii) Paheli cut colour full strips of paper and put them on the wall with the help of tape.
(viii) Father fried the puries in hot oil
In these activities chemical changes take place.

Note:These reactions can also be explained on the basis of thermodynamic process in which reversible process can be turned back i.e. both system and surrounding return to their original state while irreversible process in which system and surrounding do not return to their original state.